<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background: greenyellow;
            transition: all 1000ms linear 500ms;
            margin: 200px auto 0;
        }
        div:hover {
            background: plum;
            transform: rotate(240deg);
            border-radius: 50%;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>